package main import (    "encoding/json"    "fmt"    "os") type ConfigStruct struct {    Host              string   `json:"host"`    Port              int      `json:"port"`    AnalyticsFile     string   `json:"analytics_file"`    StaticFileVersion int      `json:"static_file_version"`    StaticDir         string   `json:"static_dir"`    TemplatesDir      string   `json:"templates_dir"`    SerTcpSocketHost  string   `json:"serTcpSocketHost"`    SerTcpSocketPort  int      `json:"serTcpSocketPort"`    Fruits            []string `json:"fruits"`} type Other struct {    SerTcpSocketHost string   `json:"serTcpSocketHost"`    SerTcpSocketPort int      `json:"serTcpSocketPort"`    Fruits           []string `json:"fruits"`} func main() {     jsonStr := `{"host": "http://localhost:9090","port": 9090,"analytics_file": "","static_file_version": 1,"static_dir": "E:/Project/goTest/src/","templates_dir": "E:/Project/goTest/src/templates/","serTcpSocketHost": ":12340","serTcpSocketPort": 12340,"fruits": ["apple", "peach"]}`     //json str 转map    var dat map[string]interface{}    if err := json.Unmarshal([]byte(jsonStr), &dat); err == nil {        fmt.Println("==============json str 转map=======================")        fmt.Println(dat)        fmt.Println(dat["host"])    }     //json str 转struct    var config ConfigStruct    if err := json.Unmarshal([]byte(jsonStr), &config); err == nil {        fmt.Println("================json str 转struct==")        fmt.Println(config)        fmt.Println(config.Host)    }     //json str 转struct(部份字段)    var part Other    if err := json.Unmarshal([]byte(jsonStr), &part); err == nil {        fmt.Println("================json str 转struct==")        fmt.Println(part)        fmt.Println(part.SerTcpSocketPort)    }     //struct 到json str    if b, err := json.Marshal(config); err == nil {        fmt.Println("================struct 到json str==")        fmt.Println(string(b))    }     //map 到json str    fmt.Println("================map 到json str=====================")    enc := json.NewEncoder(os.Stdout)    enc.Encode(dat)     //array 到 json str    arr := []string{"hello", "apple", "python", "golang", "base", "peach", "pear"}    lang, err := json.Marshal(arr)    if err == nil {        fmt.Println("================array 到 json str==")        fmt.Println(string(lang))    }     //json 到 []string    var wo []string    if err := json.Unmarshal(lang, &wo); err == nil {        fmt.Println("================json 到 []string==")        fmt.Println(wo)    }}